package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;


@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
     private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private  DishMapper dishMapper;
    @Autowired
    private SetMealMapper setMealMapper;

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果已经存在了,只需要将数量加一
        if(list != null && list.size() > 0) {
            ShoppingCart Cart = list.get(0);
            Cart.setNumber(Cart.getNumber() + 1);//商品数量加一
            shoppingCartMapper.updateNumberById(Cart);//更新数据库
        }else {
            //如果不存在,需要插入一条购物车数据

            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null) {
               //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
               //本次添加到购物车的套餐
                Long setmealId = shoppingCartDTO.getSetmealId();

                Setmeal setmeal = setMealMapper.getById(Math.toIntExact(setmealId));
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);



        }






    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long currentId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(currentId)
                .build();

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        return list;
    }

    @Override
    public void cleanShoppingCart() {
        Long currentId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(currentId);
    }

    @Override
    public void deleteOneMoreShopping(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        Integer number = list.get(0).getNumber()-1;
        shoppingCart.setNumber(number);
        //判断数量减一后是否是零
        if(number==0)
        {
            shoppingCartMapper.deleteOneMoreShoppingCart(shoppingCart);
        }else {

            shoppingCartMapper.updateOneMoreShoppingCart(shoppingCart);

        }






    }
}
